Concentrating-table.



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Tnum CA M a M w 6 w 6. M ux 9 m W N PATENTED AUG. 8, 1905.

PATENT OFFICE.-

THOMAS F. SHERIDAN, OF CHICAGO, ILLINOIS.

CONCENTRATlNG-TABLE.

Specification of Letters Patent.

Patented. Aug. 8, 1905.

Application filed February 6, 1904. Serial No. 192,446.

To all whom it nuty concern:

Be it known that I, THoMAs F. SHERIDAN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Concentrating-Tables, of which the following is a specification.

The invention relates to that class of concentrating-tables which are provided with riffle-boards that have a vibratory motion parallel to the plane of the separating-surface thereof and which are provided with rifled and smooth portions for the purpose of separating the values from the waste materials, all of which will more fully hereinafter appear.

The principal object of the invention is to provide a simple, economical, and eflcient rifle-board for concentrating-tables.

The invention consists principally in a rifleboard provided with a smooth separating-surface at one end thereof and provided with rifles having their discharge ends opening upon and substantially bounding two sides thereof, substantially as described.

The invention consists, further and finally, in the features, combinations, and details of construction hereinafter described and claimed.

In the accompanying drawing, the figure represents, in plan view, a concentrating-table having a rifle-board constructed in accordance with my improvements looking at the same from above.

In illustrating and describing these improvements I have only illustrated and described that which I consider to be new, taken in connection with so .much as is old as will properly disclose the invention to others and enable those skilled in the art to practice the same, leaving out of consideration other and well-known elements, which, if set forth herein, might tend to confusion, prolixity, and ambiguity.

In constructing a concentrating-table in accordance with these improvements I provide a rifle-board having a four-sided or quadrilateral smooth separating-surface a at one end thereof, upon which the values are finally separated from the gangue and lighter or waste materials. It will be noticed on examining the drawing that this table, which is transversely inclined and adapted to be reciprocated in any desired ordinary or wellknown manner, has two parallel sides, an upper side I) and lower side 0, and divergent end portions (Z and a, so that the front end edge and the lower side edge are in oblique-relation to each other.

To assist in the separation of the values from the waste materials, the board is further provided witha plurality of rifles f, arranged at an incline to the side portions and substantially at right angles to one side of the quadrilateral smooth separating-surface and to one endthe inclined end-of the board.

Any desired mechanism may be provided for the purpose of imparting a vibratory motion to said table, and said vibratory motion is imparted to said table in the direction of the length of its rifles, so as to throw the materials to be separated forward from the head of the table to the'foot thereof, all of which is well known and understood in this art and needs no further illustration or description herein.

The material enters the table from the box g onto the surface it thereof and contacts the multiplicity of parallel-arranged rifles, the upper set of which rifles contact-the front end or edge of the table and are substantially equal in length, terminating at their rear ends in a line parallel with the front end or edge of the table, the desire being to subject the materials at first and at once to the maximum effect of rifles of the necessary length, and thereby prevent any sudden flushing or washing over of the values. The separation takes place in a uniform step-bystep manner and not in a progressive manner, as is the case where the rifles vary in length. It will further be seen that the table presents asmooth surface of maximum size, upon which the final separation or washing effect may be obtained, all of which will be understood and appreciated by those skilled in the art. It will also be observed that these rifles substantially bound two sides of the separating- I surfacenamely, the forward and lower sidethereby confining the concentrates within the influence of the smooth separating-surface and tending to throw the material to be sepa rated from all of said rifles onto vthe smooth separating-surface. In other words, the upper set of riflesthose which contact the front endextend from such end to the smooth-surface portion rearward thereof in the direction of the concentrates-discharge end (i of the table. The lower set or series of riflesthose which contact the lower side or edge of the tableextend from such lower side edge rearward to the smooth-surface portion. The first set of rifiies are of substantially equal length, and the second set are of constantly-diminishing length as they approach the lower side and rear end of the table, and the rear or concentrates-discharge end of each riiile extends beyond the end of the riflie next above it, as do those of the upper series, but to a greater extent, so that they subtend the entire lower side of the smooth-surface portion. The upper series of rifiies subtend the entire front side of such smooth-surface portion. The middlings discharged by the upper series of riflles upon the smooth-surface portion are thus, in eflect, reconcentrated, and any values are diverted back to the smooth-surface portion and to the concentrates-discharge against the spray or slight flow due thereto to carry them into the gangue discharge or trough. The effect of the above is to provide practically the equivalent of a second concentrating-table, reconcentrating the rniddlings discharged from the first or upper series of riflies, and discharging the gangue quickly from the front lower side. The gangue-trough extends along the entire length of the lower side of the table, as shown in the drawing, and the concentrates discharge extends theentire length of the concentrates end or smooth-surface portion. By this arrangement the longest riilles are where they are needed mostnanne1y, at the front upper portion of the table-and the gangue which passes over them is at once discharged by the progressively-diniinishing length of the lower series of rifiles, all tending to pro- 01 uce advantageous results by preventing waste of values and producing high-grade concentrates, thus obviating the necessity of a second table for the middlings in most cases.

I claim 1. A reciprocating transversely inclined concentrating-table having a lower side edge and a forward end edge in oblique relation to each other, a series of rifiies of substantially equal length extending from the forward end toward the rear end of the table upon the upper portion thereof, a smooth-surface portion between the rear ends of such rifiles and the rear end of the table, and a second series of riflies of progressively-diminishing length extending progressively from the lower side edge of the table wholly subtending such smoothsurface portion and adapted to return concentrates thereto.

2. A reciprocating transversely-inclined concentrating-table having a lower side edge and a forward end edge in oblique relation to each other, a series of riflies of substantially equal length extending from the forward end toward the rear end of the table upon the upper portion thereof, asmooth-surface portion 

